Remove duplicate implementation of cohorts (verified track) by deprecating & removing related code and libraries

tCRIL Funded Contribution: Context & Background

This deprecation work is being undertaken as part of a General Deprecation project funded by tCRIL to expedite a backlog of deprecation debt. The goal of this project is to finish the removal of several unfinished deprecation tickets that we have not been able to complete ourselves due to time constraints.

Project-level metrics:

Impact: Ease of development/time to market. Measure: DEPR tickets moved to 'Removed' and LOC removed.

We have many deprecation projects in the pipeline and that have been announced to the community, but we don't have the resources to remove all the technology ourselves. We have allotted a general bucket of hours that we can devote to deprecation work to help reduce the pain and complexity of this 'dead' code for future engineers. There are a few general categories of deprecations that we have chosen to focus on:

Unsupported libraries Multiple versions of the same feature Incomplete migrations MFE replacement work